水土保持学报2017，Vol.31Issue(5)：240-246,7.DOI:10.13870/j.cnki.stbcxb.2017.05.37
干旱区土壤剖面无机碳分布及其与盐碱性的关系
Distribution of Inorganic Carbon in Soil Profile and Its Relationship with Soil Saline-alkali Property in Arid Area
摘要
Abstract
Soil inorganic carbon is the main carbon form in arid area.Its distribution can affect the pattern of carbon accumulation and storage in the soil profile.Due to the lack of soil profile data in deep soil layer,the carbon distribution and carbon storage characteristics of soil profiles are hard to accurately quantify,so the amount of inorganic carbon in soil is uncertain.This research was conducted on two typical kinds of land (farmland and uncultivated land) in the Sangong River watershed of Xinjiang,China.Soil profiles were sampled from topsoil to deep soil until to near shallow groundwater,and a total of 190 samples were obtained in six soil profiles.The distribution characteristics of soil inorganic carbon (SIC) and soluble salt ion in the sampled soils were analyzed,and the relationship between inorganic carbon and soil salinity was studied by redundancy analysis.The results revealed the following:(1) the SIC content of farmland was significantly higher than that of the uncultivated land (p ＜0.05),and the SIC content of farmland increased by 27.9％,the range of change increased by 3.66 times compared with uncultivated land.Besides,the SIC contents of profiles in the uncultivated land and farmland were exhibited a distribution of "S" type and "M" type,respec tively.(2) The soluble salt ions content of the farmland was significantly lower than that of the uncultivated land in the same soil layer (p ＜0.05),and the distribution of soluble salt ions content in soil profile showed an increase-decrease trend in the uncultivated land,while a decrease trend in the farmland,and which indicated that the quantity and distribution characteristics of soluble salt ion content in soil profile were significantly changed by agricultural activities.(3) The reverse of soil inorganic carbon of all soil profiles followed the order of 0-100 cm soil layer ＜ 100-300 cm soil layer ＜ below 300 cm soil layer,and the values were significantly different among three soil layers,however,at same soil layer the proportions of soil inorganic carbon reverse were basically the same in uncultivated land and farmland,the values of three soil layers were 10％,35％ and 55％,respectively (p＜0.05).(4) The order of the contribution of soil salinization factors to SIC was get through the redundancy analysis,and positive correlation was listed in the order of pH ＞ ESP ＞ SAR ＞ CO32-＞ HCO3-,negative correlation was listed in the order of K+＞ Ca2+＞ Mg2+＞ Cl-＞ Salt ＞ SO42-＞ Cl-＞ Na+.关键词
土地利用/土壤无机碳/碳储量/土壤盐分/土壤可溶性盐离子/冗余分析Key words
land use/soil inorganic carbon/carbon storage/soil salinity/soil soluble salt ion/redundancy analysis分类
农业科技引用本文复制引用
雒琼,王玉刚,邓彩云,马健..干旱区土壤剖面无机碳分布及其与盐碱性的关系[J].水土保持学报,2017,31(5):240-246,7.基金项目
新疆自治区杰出青年科技创新人才培养项目(2014711009) （2014711009）
国家自然科学基金项目(41371200,41671114) （41371200,41671114）
中科院西部之光项目(2015-XBQN-A-06) （2015-XBQN-A-06）
